Bread machine and railway semaphore: what they have in common

1. Step 1. Bread machine — uses — Microcontroller. Programs.
2. Step 2. Microcontroller — is part of — Remote control. A microcontroller sends the codes.
3. Step 3. Remote control — has part — LED. An infrared LED.
4. Step 4. LED — is part of — Traffic light. LEDs.
5. Step 5. Traffic light — evolved from — Railway semaphore. The first traffic light was a railway-style semaphore.

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